... advanced MCU single-chip micro-processor, Surface Mount Technology and Two Wire non-polarity Input, the Interface Module OM513 possesses ... showing twinkling green is for normal, and twinkling red for fire alarm.Specifications Operating Voltage: Two-wire bus, DC20V~DC28V, non ... C Related Humidity: ≤95% (40±2°C)Orena Sales and ServiceShenzhen Orena Photonic Technology Co., LtdOrena Bldg, Zhong'an ...